The 49-year-old musician enjoyed a lengthy lunch with the actor, 73, in the South of France last month, and ended up dining with him for a whopping eight hours, reported Female First.
"I sat next to him and I've got to say he didn't have a clue who I was. As he was leaving, he said, 'Write down the name of that band again that you were in.'
"We had this lunch that started at one o'clock in the afternoon... And he left at about eight or nine. He was there for about eight hours. If I ever have the pleasure of meeting him again, he'll just go, 'I've never met this guy'," Gallagher said.